books.google.com - Until its use declined in the nineteenth century, Indians of the southeastern United States were devoted to a caffeinated beverage commonly known as black drink. Brewed from the parched leaves of the yaupon holly (Ilex vomitoria), black drink was used socially and ceremonially. In certain ritual purification...https://books.google.com/books/about/Black_Drink.html?id=AVFbf08bIIEC&q=Oklahoma&utm_source=gb-gplus-shareBlack Drink